Gardner, J. (1992). A Cappella: An anthology of unaccompanied choral music from seven centuries / Compiled and ed. by John Gardner. Oxford University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGardner, John. A Cappella: An Anthology of Unaccompanied Choral Music from Seven Centuries / Compiled and Ed. by John Gardner. Oxford [u.a.]: Oxford University Press, 1992.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGardner, John. A Cappella: An Anthology of Unaccompanied Choral Music from Seven Centuries / Compiled and Ed. by John Gardner. Oxford University Press, 1992.
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